Recording Details

Abstract

Many of the topological insulators, in their naturallyavailable form are not insulating in the bulk. It has been shown that some of these metallic compounds,become superconductor at low enough temperature and the nature of theirsuperconducting phase is still widely debated. In this talk I show that eventhe s-wave superconducting phase of doped topological insulators, at lowdoping, is different from ordinary s-wave superconductors and goes through atopological phase transition to an ordinary s-wave state by increasing thedoping. I show that the critical doping is determined using the SU(2) Berry phase on the fermi surface of dopedtopological insulator and can be modified by different tunable features of thematerial. At the end I present the results of a recent experiment on theJosephson junctions made of thin films of Bismuth selenide , which can beexplained using our theory of doping induced phase transition in topologicalinsulators.